by using fixed QTextBoundaryFinder behavior.
Update QQuickTextInput autotests.

Task-number: QTBUG-11365

Change-Id: I81761c019e2fe80c9795fe54a2a990bfc5d4b709
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>